Resistant-surface alloy of iron



Patented Apr. 28, 1925.

UNITED STATES PATENT OFFICE.

GEORGE H. CHARLS, OF CANTON, OHIO, ASSIG'NOB: TO UNITED ALLOY STEEL 601B I PORATION, OF CANTON, OHIOQA CORPORATION OF NEW RESISTANT-SUB-FACEALLOY OF IRON.

No Drawing.

To all whom it may concern: I

Be it known that I, GEORGE H. CHARLS, a citizen of the United States,and a resident of Canton, Stark County, State of Ohio, 5 have inventedan Improvement in Resistant- Surface Alloys of Iron, of which'thefollowing is a specification.

This invention relates toalloys of iron. One of the objects thereof isto provide a practical iron alloy, the surface of which is thoroughlyresistant under conditions of use to any agent tending'tocorrode ordiscolor it. Another object is to provide an alloy of the above natureof good physical properties. Another object is to provide an alloy ofthe above nature which will be inexpensive and suitable for-manufactureon a large scale. Other objects will be in part obvious and in partpointed out hereinafter.

The invention" accordingly consists in the combinations of elements andin the ideas hereinafter illustratively set forth, and the scope of theapplication of which, will be pointed out in the appended claims! Beforeconsidering the invention in detail, it may be noted that the term ironis used in a broad sense to comprehend not only pure iron but ironincluding carbon, the latter making what might be more specificallytermed steel. It is also to be noted that the term resistant surface isintended to denote a characteristic b virtue of which the entire body ofthe al 0y is such that if its surface be exposed, such surface willresist any agency tending to alter its character, whether by corrosion,staining, heat or otherwise. 1

In the alloy embodying my invention I include chromium, molybdenum andcopper.

40 A composition which I have found to give excellent results comprisescopper from .40% to .60%, molybdenum from .05% to .12% and chromium from16.0% to 20.0%.

The carbon is preferably kept low, by

which is meant in this connection 20% or less. An amount of carbon whichhas given very desirable results is from .03% to .07

It is to be understood th t none of the above ranges-are unnecessary toattain many of the advantages of my invention, as they may beconsiderably broadened. However,

- both the copper and. molybdenum arelpreferably to be used in smallamounts, as small quantities of them are most efficacious in attainingthe desired character of the sum Application filed April 14, 1924..Serial No. 706,564.

face of the alloy. It may be noted that the conjoint use of copper andmolybdenum is highly advantageous, as when used together they have aneffect markedly superlor to that of either used without the other.

It is to be understood that in this alloy there. are usually presentsmall amounts of phosphorous, sulphur, and other, elements commonlypresent in commercial iron and steel, but such elements are to be keptas low as possible. a

I also prefer to add vanadium in an amount ranging from .10% to .50% forbest results in scavenging the metal.

The various elements are added preferably with the iron in molten formin such manner as to attain the various constituents throughout the massof the alloy.

As the illustrative alloy above set forth' might be varied in manyrespects without departing from the scope of this invention, it is to beunderstood that all matters herein set forth are to be interpreted asillustrative and not in a limiting sense.

I claim as my invention 1. A resistant-surface alloy of iron comprising,in combinationwith the, iron, chromium from 3.0% to 30.0%, copper from.10% to 2.0%, and molybdenum from .05% to 35%. Y

2. A resistant-surface alloy of iron comprising, in combination with their0n, carbon in an amount not exceedlng 20%, chromium from 3.0% to30.0%, copper from .10% to 2.0%, and molybdenumfrom .05% to 55%.

3. A resistant-surface alloy of iron comprising, in combination with theiron, carbon in an amount not exceeding 20%, copper from 15% to 2.00%,'molybdenum from to 20%, and chromium from 3.0% to 25.0%.

4. A resistant-surface alloy of iron comprising, in combination with theiron, carbon in an amount not exceeding 20%, copper from .15% to 2.00%,molybdenum from .05% to 20%, and chromium from 16.0% to 25.0%. 5. Aresistant-surface alloy of iron comprising, in combination with theiron, carbon in an amount not exceeding 10%, copper .from 15% to-2.00%,molybdenum from 05% to 20%, and chromium from 3.0% to 25.0%.

6. A resistant-surface alloy of iron comprisingfin combinationwith' theiron, carbon in an amountnot exceeding .10%, copper from 20% to.75%,-mo1ybdenum from .05% to 20%, and chromium from 16.0%

7. A'resistant-surface alloy of iron comprising, 1n combinatlon with theiron, carbon in an amount not exceeding .10%, copper from 20% to .75%,molybdenum from .05% to 20%, and chromium from 16.0%

to 20.0%. 8. A resistant-surface alloy of iron comprising, incombination with the iron, carbon from .03% to .07 copper'from 20% to.75%, molybdenum from .05% to to .60%,:molybdenum from .05% to .12%, andchromium from 16.0% to 20.0%.

10. A resistant-surface alloy of iron comprising, in combination withthe iron, chromium from- 3.0% to 30.0%, copper from 10% to 2.0%,molybdenum from 05% to .35%, and an appreciable amount of vanadium notto exceed .50%.

11. A resistant-surface alloy of iron c0mprising, in combination withthe iron, chromium from 3.0% to 30.0%, copper from .10% to 2.0%,molybdenum from 05% to 35%, carbon in an amount not exceeding 20%, andan appreciable amount of vanadium not exceeding .50%.

' In testimony whereof, I have signed my name to this specification thisthird day of April, 1924.

GEORGE H. CHARLS.

